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screen-cast: Add screen-cast-window interface

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Typically, to stream the content of a window, we need a way to copy the
content of its window-actor into a buffer, transform relative input
coordinates to relative position within the window-actor and a mean to
get the window bounds within the buffer.

For this purpose, add a new GType interface `MetaScreenCastWindow` with
the methods needed for screen-cast window mode:

 * meta_screen_cast_window_get_buffer_bounds()
 * meta_screen_cast_window_get_frame_bounds()
 * meta_screen_cast_window_transform_relative_position()
 * meta_screen_cast_window_capture_into()

This interface is meant to be implemented by `MetaWindowActor` which has
access to all the necessary bits to implement them.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/306
(cherry picked from commit 20c9ca25c0)
This commit is contained in:
Olivier Fourdan 2018-12-05 08:48:41 +01:00 committed by Ray Strode
parent 9cde0a78d8
commit c94ee761af
3 changed files with 147 additions and 0 deletions
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2
src/Makefile.am
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@ -159,6 +159,8 @@ libmutter_@LIBMUTTER_API_VERSION@_la_SOURCES = \
backends/meta-output.h \
backends/meta-pointer-constraint.c \
backends/meta-pointer-constraint.h \
backends/meta-screen-cast-window.c \
backends/meta-screen-cast-window.h \
backends/meta-settings.c \
backends/meta-settings-private.h \
backends/meta-stage-private.h \

71
src/backends/meta-screen-cast-window.c Normal file
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@ -0,0 +1,71 @@
/*
* Copyright (C) 2018 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
*/
#include "config.h"
#include "backends/meta-screen-cast-window.h"
G_DEFINE_INTERFACE (MetaScreenCastWindow, meta_screen_cast_window, G_TYPE_OBJECT)
static void
meta_screen_cast_window_default_init (MetaScreenCastWindowInterface *iface)
{
}
void
meta_screen_cast_window_get_buffer_bounds (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds)
{
META_SCREEN_CAST_WINDOW_GET_IFACE (screen_cast_window)->get_buffer_bounds (screen_cast_window,
bounds);
}
void
meta_screen_cast_window_get_frame_bounds (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds)
{
META_SCREEN_CAST_WINDOW_GET_IFACE (screen_cast_window)->get_frame_bounds (screen_cast_window,
bounds);
}
void
meta_screen_cast_window_transform_relative_position (MetaScreenCastWindow *screen_cast_window,
double x,
double y,
double *x_out,
double *y_out)
{
META_SCREEN_CAST_WINDOW_GET_IFACE (screen_cast_window)->transform_relative_position (screen_cast_window,
x,
y,
x_out,
y_out);
}
void
meta_screen_cast_window_capture_into (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds,
uint8_t *data)
{
META_SCREEN_CAST_WINDOW_GET_IFACE (screen_cast_window)->capture_into (screen_cast_window,
bounds,
data);
}

74
src/backends/meta-screen-cast-window.h Normal file
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@ -0,0 +1,74 @@
/*
* Copyright (C) 2018 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
*/
#ifndef META_SCREEN_CAST_WINDOW_H
#define META_SCREEN_CAST_WINDOW_H
#include <stdint.h>
#include <glib-object.h>
#include "meta/boxes.h"
G_BEGIN_DECLS
#define META_TYPE_SCREEN_CAST_WINDOW (meta_screen_cast_window_get_type ())
G_DECLARE_INTERFACE (MetaScreenCastWindow, meta_screen_cast_window,
META, SCREEN_CAST_WINDOW, GObject)
struct _MetaScreenCastWindowInterface
{
GTypeInterface parent_iface;
void (*get_buffer_bounds) (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds);
void (*get_frame_bounds) (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds);
void (*transform_relative_position) (MetaScreenCastWindow *screen_cast_window,
double x,
double y,
double *x_out,
double *y_out);
void (*capture_into) (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds,
uint8_t *data);
};
void meta_screen_cast_window_get_buffer_bounds (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds);
void meta_screen_cast_window_get_frame_bounds (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds);
void meta_screen_cast_window_transform_relative_position (MetaScreenCastWindow *screen_cast_window,
double x,
double y,
double *x_out,
double *y_out);
void meta_screen_cast_window_capture_into (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds,
uint8_t *data);
G_END_DECLS
#endif /* META_SCREEN_CAST_WINDOW_H */